Cross-section of a fossilized ammonite shell (© Marianna Armata/Getty Images)

Sanderlings, Brittany, France (© Fabrice Cahez/Minden Pictures)

Cinnamon fern, Nova Scotia, Canada (© Irwin Barrett/Design Pics/Alamy)

Moon jellyfish and golden jellyfish, Raja Ampat, West Papua, Indonesia (© Alex Mustard/Minden Pictures)

Foley's Bridge, Tollymore Forest Park, County Down, Northern Ireland (© Adrian McGlynn/Alamy)

Pont Rouge, Sainte-Agathe-de-Lotbinière, Quebec, Canada (© Jean Surprenant/Getty Images)

Female numbat, Brookton, Western Australia, Australia (© Martin Willis/Minden Pictures)

Mack Arch Rock, Oregon, USA (© Dennis Frates/Alamy)

Polar bear, Churchill, Manitoba, Canada (© Matthias Breiter/Minden Pictures)

Ancient rock tombs near Dalyan, Turkey (© Reinhard Schmid/eStock Photo)

Cumberland Island National Seashore, Georgia, USA (© Wilsilver77/Getty Images Plus)

Nohsngithiang Falls, Meghalaya, India (© Upamanyoo Das/Shutterstock)

Beavers Bend Resort Park, Oklahoma, USA (© Inge Johnsson/Alamy)

El Tajo gorge and Puente Nuevo bridge, Ronda, Málaga, Spain (© Jude Newkirk/Amazing Aerial Agency)

First Cliff Walk on First near Grindelwald, Switzerland (© Hans-Georg Eiben/eStock Photo)

Manatee in Florida, USA (© Paul E Tessier/Cavan Images/Offset by Shutterstock)

Jacobite steam train, Glenfinnan Viaduct, Inverness-shire, Scotland (© The Escape of Malee/Shutterstock)

Corkscrew Swamp Sanctuary, Florida, USA (© Bill Gozansky/Alamy)

Rame Head, Cornwall, England (© Cavan Images/Offset)

The Subway canyon, Zion National Park, Utah, USA (© Stan Moniz/Tandem Stills + Motion)

Mount Assiniboine Provincial Park, British Columbia, Canada (© Mitch Pittman/TANDEM Stills + Motion)

Forest near Invergarry, Scotland (© Matt Anderson Photography/Getty Images)

Irohazaka road near Nikkō, Japan (© LightRecords/Shutterstock)

Chocolate Hills, Bohol, Philippines (© Danita Delimont/Offset by Shutterstock)

Red squirrels, Cairngorms National Park, Scottish Highlands (© Scotland: The Big Picture/Minden Pictures)

Bohemian waxwing, Canada (© Mircea Costina/Alamy)

Pen y Garreg dam, Elan Valley, Wales (© Joe Daniel Price/Moment Open/Getty Images)

Beech trees, Harlestone Firs, Northamptonshire, England (© Andrew Baskott/Alamy)

Vinicunca (Rainbow Mountain), Peru (© Jude Newkirk/Amazing Aerial Agency)

African bush elephants, Masai Mara National Reserve, Kenya (© Yva Momatiuk and John Eastcott/Minden Pictures)